Analysis and Design of ejector freezing system

Authors

Alapati Venkateswarlu (Professor)
VR Siddhartha College of Engineering, Vijayawada, India.

A. Adilakshmi (Professor)
PVP Siddhartha Institute of Technology, Vijayawada, India.

V.K. Sharma (Professor & Vice Chancellor)
Bhagawanth University, Ajmeer, India.

Abstract

The heat driven ejector refrigeration framework offers the benefit of straightforwardness and can work from low-temperature heat vitality sources. There by, it turns out to be a good substitute to the conventional compressor-driven refrigeration system when any or a combination of heat sources is available. Chillers may speak to a contender for absorption chillers, when their cost per unit cooling power ends up equivalent or lower. This objective isn’t a long way from our present accomplishments. If input energy is waste or renewable heat, the system operating cost is mainly due to the investment in heat exchangers .Therefore, a cost reduction requires an increase of COP. This last might be enhanced by a careful design of the ejector, which requires a profound understanding into the thermodynamics and fluid flow and their complex physics. The devices and the learning for a propelled configuration are as of now accessible and the change potential is huge. Since ejector utilizes low grade thermal energy for refrigeration, so in this way as we have high thermal energy rejection in automobiles exhaust so this thermal energy can be used as heat input to the generator. By doing this the extra power developed by engine to run compressor of A/C can be eliminated and which in turn reduces the fuel consumption. here the whole performance of system depends on the efficient design of the ejector (thermocompressor). The refrigerant gas used here is R134A,R410A for which the gamma (cp/cv) value is 1.292 & according to this the ratio of inlet pressure(po) to the exit pressure(pe) i.epo/pe=0.562 therefore for different inlet pressure & back pressure values the primary motive nozzle is designed whether it should be convergent or convergent-divergent. In the same way the generator, condenser, refrigerant liquid pump capacities are calculated. If the suction pressure of ejector is high then the refrigerant in the evaporator evaporates at low temperature (te) therebywe can get more COP.